The Noiseblocker NB-BlackSilentFan XLP 120mm x 25mm Ultra Quiet PWM Fan,
manufactured by Noiseblocker, Germany's quietest fan manufacturer, the
BlackSilentFan series features extraordinary life spans and near silent
operation. The PWM feature allows the motherboard or fan controller the
most accurate control of the fan possible, letting it choose between
performance and silence as needed. Using the NB-Longlife advanced
sleeve bearing and matched with the NB-EKA drive, the BlackSilentFan
series runs more than double the life of normal sleeve bearings in
operates so quietly you'll forget they are running. These fans are
silent performance at high value!

Features:

Original Noiseblocker Quality
The fan is extremely quiet, reliable and fail safe

Quiet, Long Life Operation
The Blacksilent is designed carefully to not only last for a long time but to remain nearly silent during that entire life

Highest Durability
The ultra quiet and extremely long lasting NB-Longlife advanced
sleeve bearing uses modern engineering and materials and is matched with
the high quality NB-EKA drive with a wear and loss rate of an
unbeatable 0.01%